Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

2. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

3. In a refrigeration system, heat absorbed in comparison to heat rejected is

4. Highest temperature encountered in refrigeration cycle should be

5. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

6. The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

7. The value of C.O.P in vapour compression cycle is usually

8. Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

9. The minimum temperature to which water can be cooled in a cooling tower is

10. Cooling water is required for following equipment in ammonia absorption plant


 

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